2024 6.2L 10spd

[tlwarren08]

Truck was taken to the dealership with 600 miles on it for a "shudder" in reverse and I noticed very faint vibrations/shudders at certain speeds presumably shift points. They said the shudder in years past is like driving on a rumble strip. Mine isn't that obvious. Dealer replaced Valve control body in the transmission, which didn't resolve the issue. Has anyone else dealt with similar issues?

 

AT4 Forum Fav 👍

Sellars Toolbox Shop Towels Dispenser Bucket - Grab one through Amazon!

[Leo581]

Sounds exactly like what was happening with the older gens 8 speed transmissions. The fix was to drain, flush and refill the transmission fluid.
And yes, the vibration was exactly like driving over rumble strips.

 

[jconner00]

I also have a faint transmission shudder at 40mph and 65 mph in certain conditions, usually hovering 1500 RPMs. The dealer could not replicate it of course so they would not take any action. This article below outlines the TSB that has been issued for this:

https://gmauthority.com/blog/2023/01/gm-releases-fix-for-2022-gmc-sierra-poor-transmission-shift-quality/

 

[chaos]

This sounds almost exactly like the vibration I have at certain speeds at low RPM in my 21 5.3L. Light throttle, low engine speed, low load. Occurs at about 15-18, 35, 58, and 65ish, usually around 1200rpm. Most noticeable at low engine load - like doing down slight hill and keeping speed. Dealer of course cannot replicate problem...

 

[tlwarren08]

after 45 days the solution was to install a reman trans

 

[Veroc]

Please keep us updated if it comes back. My 2020 is doing this. I think I might have the transmisssion fluid and filter changed as this has worked for most that I have researched.

 

[tlwarren08]

Please keep us updated if it comes back. My 2020 is doing this. I think I might have the transmission fluid and filter changed as this has worked for most that I have researched.

So, when I took it in the tech rode with me and go figure we didn't get the shudder. however, another issue was when going to reverse you would feel "slack" taken out of the driveline and then a second shudder would occur, so they took it in for that. Initial solution was Valve body with no fix, so GM put a reman trans in it.

 

[Randall]

This sounds almost exactly like the vibration I have at certain speeds at low RPM in my 21 5.3L. Light throttle, low engine speed, low load. Occurs at about 15-18, 35, 58, and 65ish, usually around 1200rpm. Most noticeable at low engine load - like doing down slight hill and keeping speed. Dealer of course cannot replicate problem...

I have the exact same problem with my 23 at4, already even to the shop and they said it felt fine to them.it’s like a slight vibration at those speeds.oddball speeds and is extremely annoying